Damper-actuating mechanism for furnaces



April 27 1926.

I B. M cLELLAND DAMPER ACTUAIING MECHANISM FOR FURNACES Fil u 1922B-ShQets-Sheot' "27,1926. B. M CLELLAND DAMPER ACTUATING MECHANISM FORFURNACES Filed June 26, 1922 6 Sheets-Sheet 2 a 1W2 W April 21, 1926.

B. M CLELLAND DAMPER ACTUATIHG MECHANISM FOR FURNACES Filed June 1922 6Sheets-Sheet 5 April 27 192 B. M CLELLAND DAMPER ACTUATING MECHANISM FORFURNACES Filed June 26, 1922 6 Sheets-Sheet. L

April 21 1926. 1,582,413 a. MCCLELLAND DAMPER ACTUATING maoumsu FORvumucus Filed June 26, 1922 s cs-she t 5 B. M CLELLAND DAMPER ACTUATINGMECHANISM FOR FURNACES Filed June 26. 1922 ,s Sheets-Sheet 6 PatentedApr. 27 1925.

BERT MQCLELLAND, or snLLn'RsviLLn, PENN YLVANIA.

DAMPER-ACTUATING MEorrANIsM' non FURNACES.

Application filed June 26; 1922. Serial No. 570,818.

To all whom it may concern:

Be it known that I, BnnrllfoC/nnnLAND, a citizen of the United States ofAmerica, and resident of Sellersville, county of Bucks, State ofPennsylvania, have invented certain. new and useful Improvements incscapement and sheave of Figs. 11 and 12,

Damper-Actuating Mechanism for Furnaces, of which the following is atrue and exact description, reference being had to the,

accompanying drawings, which form apart thereof. g

My invention relates to mechanism for operating the dampers offurnacesand has for its object to provide simple and eilicient mechanism wherebythe dampers can be set to promote combustion in the furnace andautomatically shiftedto a position in which they will restrict"combustion in a predetermined time limit. r

The nature of my invention will be best understood as described inconnection with the drawings in which it is illustrated, and in which- 1li igure. l is a view showing the furnace and its dampers ZLIlClflconvenient way of connecting the dampers to the actuating mechanism.

Figure 2 is av side elevation of the casing opening, the damperactuating mechanism partly broken away to show a portion of itscontained mechanism.

Figure 3 is averticaisection taken on the line 3-3 of Fig. 2.

Figure 4, a fragmental view of a portion of the casing looking upwardfrom bottom ofFig.3.-1

Figure 5 is an elevation of'the time escapement device forming part ofthe damper actuating mechanism.

Figure (3 is a sectional'view taken along the center line of the casingand dial and showing the time escapement device not sectioned but inelevation. Y

Figure 7 is a sectional view on the line T-7 of Fig. 8; Y

Figure 8 is a front view of. the dial and pointer.

Figure Sis an elevation showing a modificationof the mechanism shown inthe above figures of the drawing- Figure 10, an elevation showingmodification.

another Figure 11 is a side elevation of a casing partly broken away andthe mechanism of still another modified form of my device.

'capeinent taken as on plate D screws, as indicated at D gages withanother latching Figure 12 is a front view of the mecha nism shown inFig. 11, with the front ofthe casing broken away and the double sheaveshown partly in section'on theline 12, and partly in section on the line12.

. Figure 13 is aside elevation of the time and Figure 14: is a face viewof the time es the line l414 of Fig. 13.-

- :Figure 15 is a view showing a modification of the connections foractuating the dampers, adaptedfor use. with such a modification of niy'invention as is shown in .Ayindicates the furnace. controlling theadmission of tom of the furnace. C, a. damper controlling the admissionof air to the flue C. D is a casing enclosing the damper actuatingmechanism, this casing being secured to a adapted to be secured to awall.

air to the bot- B, the damper The casing D is seemed to studsDprojecting' from the plate D by means of D indicates another studprojecting from the'plate D and serving a purpose to be explained. D1.)", are openings formed in the casing D for the passage of the chains.E indicates the time escapement device which is secured to studs F, F,extending inward from the front face of thecasing I) and is made up, asshown, of supporting plates E, E, secured to and spaced by studs E etc.G is the main shaft of the time, escapement which extends atone endthrough the front face of thecasing and. has attached toit a pointer Hwith an actuatinghandle H, the pointer being movable over adlalindicated at D,

ley L with the gear wheel L which has a bearing on the shaft Gr. Firmlysecured to the end of the shaft G is'a lever arm K having, see Fig. 8, afinger K which operates in connection with a latching device to-bedescribed, and in Fig. 2, it endevice to be described. K indicatesanother lcverarm extending from the shaft-G and 0138 33131119, inconnection with the stop pin indicated at K}. ;The time escapementmechanism, as

shown in Figs. 5 and 6, is of the usual type, the gear wheel L beingengaged with the pin gear M on the shaft M, the pin gear being anextension from the hub of the gear wheel N which is engaged with a pinwheel N on the shaft N, the pin wheel N being an extension from the hubof the gear wheel N This gear in turn engages with the pin gear 0 on theshaft 0, this pin gear being attached to the escapement wheel 0 which,in turn, operates in connection with the usual double acting pulley,hair spring and balance wheel, as indicated at P.

' Q, is a sheave wheel having extending from its outer periphery theteeth indicated at Q with the engaging ratchet face indicated at Q Thesheave Q, is journalled on a pin D projecting inward from the plate Dand is formed with a circular recess D. on its face. R is a cam which issecured to the end of the bearing pin 1) and is made adjustable thereon.This cam, as shown, see Fi 3, is formed with two cylindrical faces, Rand R connected by an incline indicated at S, S, indicates a two armlever pivoted on the stud D, the arm S having a turned up end indicatedat S and the arm S a turned up end indicated at S. The latching end Sof. this lever. is so located that it lies in the path of the finger Qof the sheave Q and the latching end S of the lever arm is so located asto be engaged by a finger K of the lever K as shown in Fig. 8. T is alever pivoted to the face of the sheave at Q5 having extending from it afinger T which lies in contact with the surface of the cam R and afinger 'l located so as to engage the linger 1" of the lever K, as shownin Fig. 3. U is a cord, cable or chain secured to the groove sheave T,as indicated at U and carrying a weight, indicated at U on one sideofthe sheave, and an annular ring indicated at U 011 the other side. Thebranch of the cable carrying the weight U is connected to the damper B,as indicated in Fi g. 1, while the other branch of the cable isconnected to the damper C, as indicated at T this branch of the cablepassing over the sheaves indi cated at U, U.

XV, see Figs. 3 and '7, indicates a stop finger extending from the plateD into a recess in the face of the sheave Q, in which recess is alsoformed a stop finger V adapted to co-act with the finger W, V indicatinga cushion device secured, as shown, to the finger in operation and innormal position of rest, the parts are in the position shown best inFig. 3, which corresponds to the position in which the damper B isclosed and the damper C opened. It being desired to promote combustionin the furnace theoperator pulls down on the ring U rotating the sheaveQ until its finger Q, engages and latches with the finger S of the twoarm lever SS. In this position the damper B is open and the damper Cclosed as the sheave Q, rotates its pivoted latch lever T, having itsend T engaged with the finger K of the lever K rotates the shaft G ofthe time escapement, winding up the time escapement spring and movingthe finger H over the dial 1) so as to indicate just to what point thetime escapement is set. During the first part of the rotation of thesheave Q, the

finger T of the pivoted latch lever '1 rides over the circular camsurface It finally coming in contact with the inclined shoulder R whichlifts the latch lever T so as to disengage it'from the finger K and,after this disengagement, the cam contacting linger 'l" rides over thesurface R of the cam but no longer imparts any motion to the timeescapement sheave. Obviously, by adjusting the cam R the time escapementcan be set to operate for any desired time limit.

' As soon as the time escapement is detached from the sheave Q, by theaction of the cam R it begins to operate and in operation carries thelevers K and K backward toward their normal point of rest and at the endof the period for which the time escapement has been set, the finger Kof the lever K comes in contact with the finger S of the lever arm S,pushing this lever arm toward the left, as shown in Fig. 3, with theeffect of raising the lever arm S and its latching finger S so as todisengage this finger with the finger Q of the sheave and as soon asthese fingers are disengaged the weight U is free to move downward,rotating the sheave in an anti-clockwise direction, closing the damper Band opening the damper C, the motion of. the sheave being arrested bythe contact of the stop fingers W, V

The motion of the time escapcment is arrested by. the contact of thelever arm K" with the stop pin K and it will be obvious that by theconstruction shown and described the main spring of the time escapenicntis wound up every time the dampers are set, so that the time escapementneeds no special winding.

While I believe my invention is best embodied in the construction abovedescribed, it is capable of useful application in many modified forms.Thus, in the construction indicated in Fig. 9, l have indicated aconstruction in which the sheave Q, provided as before with latchingfinger Q, operates in connection with a double armed lever as, the arm 5having a latching finger s and the arm .9 having attached to it a pivotpin and extending from it the finger s" pivoted on the pin s is arotatable arm 8 having a finger s which contacts with the arm s, asshown in Fig. 9, and a projecting finger s normally held in the positionindicated by the spring 8 In this construction the time escapement shaftG has attached to its inner v in Fig.

is affected by the rotation dampers for combustion, the operator, as

before, pulls downonthe ring a, rotating the sheaveQ, until its finger Qengages the finger The operator must also in this modification turn thepointer and shaft Gr by hand to the position which determines the periodof the operation of the time escapement and the time escapment inoperation rotates the shaft G in an anti-clockwise direction until itsfinger 1713 comes in contact with the finger s", pushing the lever s tothe loft and lifting the finger 8 out of engagementwith the finger Q.The pivotal attachment of the finger s to the lever arm 8 is to enablethe finger 7a to push it out of its way when rotated from the positionshown in dotted lines. In the modification shown 10, the set of thewhole apparatus of the time escapement shaft G which, of course, isreadily affected by turning thehandle H attached to the pointer H. Thesheave Q in this special construction has secured to its rim a ratchetindicated at g which is actuated by a ratchet pawl on the arm SS of thedouble armed lever, the other arm S of which has a turned up finger SSlocated in position to be engaged by an arm or finger KK secured to theshaft G. The rotation of the shaft G in a clockwise directionfirstpermits the ratchet pulley arm SS to engage with the ratchet g andthen, by contact with the finger Q of the sheave rotates the shaft andratchet pulley by a cord or cable U which, in this construction, isconnected with the dampers, as indicated in Fig. 15. The

motion imparted to the leases the sheave finger Q from dampers'in thiscon struction is proportioned to the angular motion given to the shaft Gand the effect of the time escapement is to carry the finger or arm KKgradually backward until it contacts with the finger SS when it retheratchet 5 with the result that the dampers are at once shifted to theirnormal position. In the modification shown in Figs. 11 to 14 inclusive,a double grooved sheave X having the grooves X, X is secured to a shaftX which extends through the dial face of the casing and-has secured toit the pointer X with attached handle X. Pivotallv attached to the rearratchet pawl X pressed inward by a spring indicated at X This pawlengages with the teeth of a ratchet g secured to the shaft 9 which isthe main shaft of the time escapement indicated at EE. This timeescapement is of the usual type but in this construction has no coildriving sprin side of the sheave X is the V The connections from thesheave to the dampers in this modification are 'inadc through the chainsUU secured in one of the grooves as indicated at 'UU and the chains ansecured in the other groove as indicated at an. In the operation of thismodifiedw device the operator can either rotate the sheave by means ofthe handle X or by pulling down on the chains mi. Rotation of the sheavecauses the pawl X to'move over the corresponding arc of the ratchetwheel g" and as soon as the apparatus is set to the desired point theweight U acting through the chain UU turns the shaft in an anticlockwisedirection, this motion being communicated through the pawl X and ratchetg to'the shaft G of the time escapement which regulates the speed ofmovement with which the sheave can rotate and with which the dampersconnected with the sheave are correctly returned to their normalpositions.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. Mechanism for shifting the dampers of a furnace which regulate thedraft of air through the fuel bed comprising a sheave to whichconnection to the dampers can be secured, a time escapement having amain engaged when the sheave is in normal position of rest whereby therotation of the sheave rotates the main shaft and windsthe spring of thetime escapement, a cam for dis connecting the latch mechanism when thesheave has moved: F through a determined are, a latch for holding thesheave in fixed position after it has moved through a determined arc anda latch releasing finger actuated by the time escapement whereby thesheave is released after a determined time.

2. Mechanism for shifting the dampers of a furnace which regulate thedraft of air through the fuel bed comprisinga sheave to whichconnectionto the dampers can be se cured, a time escapement having a main shaftand driving spring, a latch mechanism engaged when the sheave is innormalposition of rest whereby the rotation of the sheave rotates themain shaft and winds the spring of the time escapement, an adjustablecam for disconnecting the latch mechanism when the sheave has movedthrough a determined are, a latch for holding the sheave in fixedposition after it has moved through a determined are, and a latchreleasing fincan be sei a main mined arc, a latch for holding the sheavein fixed position after it has moved through a determined are and ahitch releasing finger actuated by the time eseapement whereby he sheaveis released after a determined time.

BERT MGGLELLAND.

